feat(auth0-auth-js): add Session Transfer Ticket support to AnonymousSessionClient - #283
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe SDK adds transfer-token minting to ChangesAnonymous transfer token
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Caller
participant AnonymousSessionClient
participant AnonymousTokenEndpoint
Caller->>AnonymousSessionClient: mintTransferToken(sessionToken)
AnonymousSessionClient->>AnonymousTokenEndpoint: POST /anonymous/token with client data and transfer audience
AnonymousTokenEndpoint-->>AnonymousSessionClient: anon_transfer_token
AnonymousSessionClient-->>Caller: token string or null
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yogeshchoudhary147
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Inline comments:
In `@packages/auth0-auth-js/src/anonymous-session/anonymous-session-client.ts`:
- Around line 356-365: Move the buildClientAuthBody call in mintTransferToken
inside the existing try block so key-import or assertion-signing failures are
caught and the method returns null as documented.
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packages/auth0-auth-js/src/anonymous-session/anonymous-session-client.tspackages/auth0-auth-js/src/types.ts
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| * SDKs that support anonymous sessions set this automatically — you do not need to | ||
| * pass it manually. | ||
| */ | ||
| anon_transfer_token?: string; |
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IMO anon_transfer_token shouldn't live on AuthorizationParameters in auth0-auth-js. The core SDK's AuthorizationParameters should be OAuth/OIDC primitives: scope, audience, redirect_uri - parameters that a caller might legitimately configure. anon_transfer_token is an internal SDK-to-platform detail that:
- Framework SDKs (server-js, spa-js) inject silently and automatically, it's never part of the caller-facing API in either SDK
- The JSDoc itself acknowledges this: "SDKs that support anonymous sessions set this automatically —you do not need to pass it manually"
- Making it an explicit typed field on the core interface exposes it to every consumer of auth0-auth-js as a legitimate thing to set, which creates a confusing and misleading API surface
The [key: string]: unknown index signature on AuthorizationParameters already exists for exactly this kind of internal SDK parameter.
This keeps the core auth-js SDK clean and minimilistic.
| const response = await this.#customFetch(url, { | ||
| method: 'POST', | ||
| headers: { 'Content-Type': 'application/json' }, | ||
| credentials: 'include', | ||
| redirect: 'error', | ||
| body: JSON.stringify(body), |
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Passing credentials: 'include' seems to be a problem here.
First, this method is specifically for exchanging the session token with a transfer ticket, including a cookie doesn't seem to serve any purpose other than a security risk.
Second, the Auth0 platform's session token resolution prioritises the cookie over the request body, so in a browser context, if an auth0_anon cookie is present it silently overrides the session_token we pass in the body. In the happy path both refer to the same session, but if they've drifted (e.g. localStorage cleared but cookie not, or cookie from a previous session) the transfer ticket is minted for the cookie's session, not the one the caller passed. The SDK has no way to detect or signal this.
Unlike createSession and getAccessToken, where the cookie being the source of truth is intentional, mintTransferToken takes an explicit session token as its input, implying the caller knows exactly which session to transfer. credentials: 'include' undermines that contract.
Removing it is a safe bet -
- Server-side (RWA / Node.js): credentials: 'include' is a no-op on native fetch, no change in behaviour.
- Browser (SPA): session is resolved from the explicit session_token in the body, which is the intent.
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Summary
mintTransferToken(sessionToken)toAnonymousSessionClient— callsPOST /anonymous/tokenwithaudience: "urn:auth0:anon_transfer"and returns the resulting 30s single-use JWE. Returnsnullon any failure so callers are never blocked from proceeding with login.anon_transfer_token?: stringtoAuthorizationParametersas an explicit typed field for upper-layer SDKs to append the ticket to the/authorizeURL.Test plan
auth0-auth-jsunit tests passSummary by CodeRabbit